<!DOCTYPE html>
<html lang="zh-CN">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>影子DOM</title>
  <!-- 
    查看影子dom结构(viode) => 控制台 => settings => Elenments => 勾选show user agent shadow Dom
    看到shadow-root这个结构
   -->
</head>

<body>

</body>
<script>
  "use strict"; {

  };
</script>

</html>